Hello and welcome!
We have a weekly game (almost) every Thursday at the Spielbar at 19:30. We play various games there, using various systems.
No problem with being a newbie, in fact, because we play so many games, most people are newbies for the particular game played that week.
If you are looking more specifically for D&D5 (plausible as you mentioned YouTube), then we have a campaign running using the Lost Mines of Phandelver starting set. You are welcome there too.